Select statement

I am using oracle 10g i have a table on my computer that i made for a friend when i load it on their computer the select statements say no data found
if i use select * from table name all the data will show
but if a column name select * from table name where duty_date = '05-JAN-11'
no data found
Please can you help

I am using oracle 10g i have a table on my computer that i made for a friend when i load it on their computer the select statements say no data found
if i use select * from table name all the data will show
but if a column name select * from table name where duty_date = '05-JAN-11'
no data found
Please can you help